WO1997008585A1 - Systeme d'amplificateurs optiques en cascade - Google Patents

Systeme d'amplificateurs optiques en cascade Download PDF

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Publication number
WO1997008585A1
WO1997008585A1 PCT/SE1996/001029 SE9601029W WO9708585A1 WO 1997008585 A1 WO1997008585 A1 WO 1997008585A1 SE 9601029 W SE9601029 W SE 9601029W WO 9708585 A1 WO9708585 A1 WO 9708585A1
Authority
WO
WIPO (PCT)
Prior art keywords
non linear
optical
pulses
loop mirror
amplifiers
Prior art date
Application number
PCT/SE1996/001029
Other languages
English (en)
Inventor
Bengt-Erik Olsson
Peter Andrekson
Original Assignee
Olsson Bengt Erik
Peter Andrekson
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Olsson Bengt Erik, Peter Andrekson filed Critical Olsson Bengt Erik
Priority to EP96929613A priority Critical patent/EP0873540A1/fr
Publication of WO1997008585A1 publication Critical patent/WO1997008585A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2308—Amplifier arrangements, e.g. MOPA
    • H01S3/2316—Cascaded amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
    • H04B10/2914—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using lumped semiconductor optical amplifiers [SOA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/2933—Signal power control considering the whole optical path
    • H04B10/2935—Signal power control considering the whole optical path with a cascade of amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S2301/00—Functional characteristics
    • H01S2301/02—ASE (amplified spontaneous emission), noise; Reduction thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping

Definitions

  • the present application is intended to generate optical pulses having a very high peak power.
  • the method is simple and non costly and in our implementation passive and independent of pulse repetition frequency, pulse width, wave length, polarization, etc.
  • a very attractive solution of the above problem would be to have the capability of using modem semiconductor lasers which are small and cheap and can produce light within a wavelength range that is less dangerous to the eyes.
  • they cannot produce the pulse peak powers which are required in many applications.
  • optically amplifying the pulses the peak power can be increased but optical amplifiers generate noise, so called amplified spontaneous emission, what makes it impossible to provide a direct cascaded connection of a plurality of amplifiers which is required for achieving very high peak power.
  • All optical power, which does not originate from the pulses, such as e.g. noise and possible other non desired signal residues, will saturate an amplifier, if it constitutes a sufficiently large fraction of the total power, what results in that the pulses will not be any more amplified.
  • the idea described hereinafter is to only transmit, by means of an element having a non linear optical transmission, only the pulses and then to amplify these again.
  • a pulse source generates optical pulses having a long repetition time in relation to the width of the pulses. They are amplified as much as possible in an optical amplifier, which adds noise between the pulses. In order to be able to successfully amplify the pulses more, all power existing between the pulses must be removed. It is made by using an element having a non linear transmission; components having a low power are not transmitted whereas components having a high power are transmitted. The transmission characteristics of such a non linear element is shown in Fig. 1. After the non linear element a signal is obtained, which only contains the desired pulses and which can be further amplified. The configuration is schematically illustrated in Fig. 2. If the desired peak power level of the pulses has not been obtained in spite of further amplification, the process can be repeated. Important characteristics of the non linear element is that broad band noise is to be processed linearly, i.e. it is not to be transmitted, and that weak coherent signals are to be strongly suppressed.
  • Figure 1 shows the transmission characteristics of the non linear element.
  • Figure 2 shows fhe block schematic of the actual method of generating optical high power pulses.
  • the pulse source (1) can advantageously be a semiconductor laser which is either pulsed in an electrical way or produces or provides constant light which is then modulated externally. Often weak residual light is obtained between the pulses which can saturate successive amplifiers.
  • the optical amplifiers (2) can be semiconductor laser amplifiers or fibre amplifiers. All optical amplifiers generate broad band optical noise which can also saturate a successive amplifier.
  • the non linear element (3) can advantageously be the non linear loop mirror described hereinafter or e.g. a non linear absorber.
  • Fig. 3 shows schematically the non linear loop mirror in the case where it is used as the actual non linear element.
  • the non linear element being constituted by the so called non linear loop mirror, originally presented by Doran and Wood 1988 .
  • the non linear loop mirror (see Figure 3) consists in the present case of a Sagnac interferometer, here fibre based (8), in which an asymmetrically placed amplifier or attenuator (4). a non reciprocal phase shifter (5) or a polarization controller and an optical non linear material (6), e.g. fibre, are introduced.
  • the coupler (7) which separates the input and output signals, is to split incoming light equally between the two output ports.
  • the signal in the direction around the loop, which has the highest peak power, obtains a larger non linear phase shift, owing to the fact that the refractive index is dependent on intensity in the optically non linear material (6), than the signai which propagates in the opposite direction.
  • the difference in the non linear phase shift between the two counter propagating signals is equal to 180°, the transmission is changed from minimum to a maximum, provided that the phase shifter (5) in the loop is correctly set.
  • the interferometer now constitutes an element having transmission characteristics according to Figure 1.
  • the optically non linear material (6) is usually constituted of an optical fibre but it can in principle be constituted of an arbitrary material having optical non linear characteristics (see the definition below).
  • This design can also be implemented by means of wave guides, etched in a substrate having all components integrated in the same substrate or as a hybrid design.
  • the third possibility is of course to use open radiation paths and discrete components.
  • the discrete components in the system are constituted of:
  • the coupler (1) splits incident light equally between two outputs the attenuator/ amplifier (A) - accomplishes that the two oppositely travelling signals in the loop will have different intensities the phase shifter/polarization controller (5) - allows an adjustment of interference conditions of the coupler optically non linear material (6) - material providing a refractive index/absorption dependent on power

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
  • Lasers (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

L'invention concerne la production d'impulsions optiques ayant une puissance de pic très élevée. Dans de nombreuses applications, il est souhaitable de pouvoir utiliser des impulsions ayant un pic très élevé (⊃ 1 kW). Un procédé très simple pour les générer serait simplement de connecter des amplificateurs optiques en cascade. Toutefois, ceci n'est pas possible, car chaque amplificateur génère du bruit, qui, avec les signaux résiduels éventuels entre les impulsions, peut saturer les amplificateurs successifs. Ce problème a été résolu en disposant un élément présentant une transmission non linéaire entre les amplificateurs. Cet élément peut être constitué d'un miroir non linéaire en boucle, d'un absorbeur saturable ou d'un amplificateur laser à semi-conducteur. Le miroir en boucle est actuellement le dispositif passif le plus efficace et le moins coûteux.
PCT/SE1996/001029 1995-08-25 1996-08-20 Systeme d'amplificateurs optiques en cascade WO1997008585A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96929613A EP0873540A1 (fr) 1995-08-25 1996-08-20 Systeme d'amplificateurs optiques en cascade

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9502960A SE517698C2 (sv) 1995-08-25 1995-08-25 Anordning vid kaskadkoppling av optiska förstärkare avsedd att förstärka optiska pulser
SE9502960-9 1995-08-25

Publications (1)

Publication Number Publication Date
WO1997008585A1 true WO1997008585A1 (fr) 1997-03-06

Family

ID=20399292

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/001029 WO1997008585A1 (fr) 1995-08-25 1996-08-20 Systeme d'amplificateurs optiques en cascade

Country Status (3)

Country Link
EP (1) EP0873540A1 (fr)
SE (1) SE517698C2 (fr)
WO (1) WO1997008585A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2799067A1 (fr) * 1999-09-29 2001-03-30 Cit Alcatel Limiteur de puissance optique
US6552844B2 (en) * 2001-06-01 2003-04-22 Agere Systems Guardian Corp. Passively output flattened optical amplifier
EP1906230A1 (fr) 2006-09-29 2008-04-02 Fujitsu Limited Amplificateur optique paramétrique
GB2471187A (en) * 2009-06-15 2010-12-22 Boeing Co Phase control and locking method for coherently combining high-gain multi-stage fiber amplifiers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5111334A (en) * 1990-01-27 1992-05-05 Alcatel N.V. Multi-stage fiber-optic amplifier
US5274495A (en) * 1990-09-18 1993-12-28 Fujitsu Limited Optical amplifier
US5400173A (en) * 1994-01-14 1995-03-21 Northrop Grumman Corporation Tunable mid-infrared wavelength converter using cascaded parametric oscillators

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5111334A (en) * 1990-01-27 1992-05-05 Alcatel N.V. Multi-stage fiber-optic amplifier
US5274495A (en) * 1990-09-18 1993-12-28 Fujitsu Limited Optical amplifier
US5400173A (en) * 1994-01-14 1995-03-21 Northrop Grumman Corporation Tunable mid-infrared wavelength converter using cascaded parametric oscillators

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2799067A1 (fr) * 1999-09-29 2001-03-30 Cit Alcatel Limiteur de puissance optique
EP1089467A1 (fr) * 1999-09-29 2001-04-04 Alcatel Limiteur de puissance optique
US6552844B2 (en) * 2001-06-01 2003-04-22 Agere Systems Guardian Corp. Passively output flattened optical amplifier
EP1906230A1 (fr) 2006-09-29 2008-04-02 Fujitsu Limited Amplificateur optique paramétrique
US7940454B2 (en) 2006-09-29 2011-05-10 Fujitsu Limited Optical parametric amplifier
GB2471187A (en) * 2009-06-15 2010-12-22 Boeing Co Phase control and locking method for coherently combining high-gain multi-stage fiber amplifiers
GB2471187B (en) * 2009-06-15 2012-03-14 Boeing Co Phase control and locking method for coherently combining high-gain multi-stage fiber amplifiers

Also Published As

Publication number Publication date
SE9502960D0 (sv) 1995-08-25
EP0873540A1 (fr) 1998-10-28
SE9502960L (sv) 1997-02-26
SE517698C2 (sv) 2002-07-02

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